A 95% confidence interval for ug - HA is given by which of the following expressions? (Us conservative value for degrees of freedom.) 10 92 (109.1- 94.5) ± 1.96, 10 92 (109.1-94.5) + 2.262, 10 92 (109.1- 94.5) ± 1.96. 10 10

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Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be
controlled with weed and soil treatment. An experiment was conducted to compare peach tree
seedling growth with soil and weeds treated with one of two herbicides. In a field containing 20
seedlings, 10 were randomly selected from throughout the field and assigned to receive Herbicide
A. The remaining 10 seedlings were to receive Herbicide B. Soil and weeds for each seedling were
treated with the appropriate herbicide and at the end of the study period the height (in
centimeters) was recorded for each seedling. A box plot of each data set showed no indication of
non-Normality. The following results were obtained:
(cm)
s (cm)
Herbicide A
Herbicide B
94.5
109.1
10
A 95% confidence interval for uB - HA is given by which of the following expressions? (Use the
conservative value for degrees of freedom.)
102 9?
(109.1- 94.5) t 1.96.
102 92
(109.1- 94.5) + 2.262.
9
10
(109.1- 94.5) + 1.96,
10
V 10
102
(109.1- 94.5) ± 2.262,
V 10 10
10 92
(109.1- 94.5) +
10
10
Transcribed Image Text:Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and soil treatment. An experiment was conducted to compare peach tree seedling growth with soil and weeds treated with one of two herbicides. In a field containing 20 seedlings, 10 were randomly selected from throughout the field and assigned to receive Herbicide A. The remaining 10 seedlings were to receive Herbicide B. Soil and weeds for each seedling were treated with the appropriate herbicide and at the end of the study period the height (in centimeters) was recorded for each seedling. A box plot of each data set showed no indication of non-Normality. The following results were obtained: (cm) s (cm) Herbicide A Herbicide B 94.5 109.1 10 A 95% confidence interval for uB - HA is given by which of the following expressions? (Use the conservative value for degrees of freedom.) 102 9? (109.1- 94.5) t 1.96. 102 92 (109.1- 94.5) + 2.262. 9 10 (109.1- 94.5) + 1.96, 10 V 10 102 (109.1- 94.5) ± 2.262, V 10 10 10 92 (109.1- 94.5) + 10 10
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